Fantasia for Piano in C minor, K. 475
av Wolfgang Amadeus Mozart
Mozart’s Fantasia for Piano in C minor, K. 475 is dated 20 May 1785 and belongs to a distinctive Viennese moment when his written keyboard works began to absorb the rhetoric—and the risks—of improvisation. Published in December 1785 alongside the Piano Sonata in C minor, K. 457 as Artaria’s Op. 11, it has long been heard both as a self-sufficient drama and as a deliberately unsettling “threshold” to the sonata [1] [2].
Background and Context
Vienna in 1785 was a city that knew Mozart chiefly as a performer-composer: a pianist with a quick theatrical instinct, famed for extemporizing as much as for presenting finished scores. The Fantasia in C minor, K. 475 is one of the clearest documents of that double identity. It sounds startlingly “free” on first encounter—full of abrupt changes of tempo, texture, and key—yet it is also a carefully composed essay in the idea of improvisation, a paradox noted by modern scholarship as central to its effect [3].
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The Fantasia’s most consequential historical entanglement is with the Piano Sonata in C minor, K. 457. In the first edition, the Fantasia was printed directly before the sonata, effectively functioning as an introduction, even though the sonata itself had been entered in Mozart’s own catalogue on 14 October 1784—seven months earlier than the Fantasia [1] [4]. That pairing was not a mere convenience of key: it proposes a large-scale narrative in which the Fantasia’s volatile “stage lighting” throws the sonata’s disciplined argument into sharper relief.
It also anchors the work socially. Artaria issued the combined publication with a dedication to Mozart’s pupil Therese von Trattner (wife of Johann Thomas von Trattner, Mozart’s landlord), an everyday Viennese connection that reminds us these pieces lived at the intersection of virtuoso culture, domestic music-making, and the prestige economy of print [4].
Composition
Mozart entered the Fantasia into his own handwritten catalogue on 20 May 1785, specifying Vienna as the place of composition [1]. In that respect the work is unusually firm on paper: it is not a “probable” date, but one Mozart himself supplied.
Yet the story of its sources has produced one of the most intriguing editorial afterlives of any late-eighteenth-century keyboard work. The autograph manuscript of the Fantasia and the C-minor sonata was long considered lost; it resurfaced dramatically and was auctioned at Sotheby’s in London on 21 November 1990, after which it entered the collections of the International Mozarteum Foundation in Salzburg [5] [2]. That rediscovery did not merely add a biographical footnote. It forced editors and analysts to rethink which readings in the early prints reflect Mozart’s last intentions, which are engraver’s or editorial interventions, and how the Fantasia’s “improvisatory” surface is—ironically—dependent on notational decisions.
One striking notational clue is Mozart’s handling of key signatures. Although the work is “in C minor,” Mozart initially wrote (and then scratched out) a three-flat signature in the autograph, choosing instead to notate most of the piece without a key signature, supplying accidentals as needed—a choice that makes the page look less “settled” than classical convention would suggest [1]. The gesture can be read as practical (avoiding awkward signature changes through remote tonal regions), but it is also theatrical: the notation itself participates in the work’s cultivated instability.
Form and Musical Character
The term fantasia in Mozart’s Vienna did not mean mere looseness; it implied a public skill—improvisation—transferred into a composed artifact. The C-minor Fantasia is thus best approached as a sequence of contrasted panels whose seams are meant to show. It begins with an Adagio in C minor, but quickly breaks the expectation that “C minor” will remain a stable home: the music traverses distant regions, including a famously radiant episode in B major (notated with its own key signature), before gathering itself for the return to the opening material [2].
Two features deserve emphasis beyond the usual “stormy minor-key Mozart” description.
First, the Fantasia’s drama is harmonic as much as rhetorical. Mozart’s rapid tonal shifts do not simply decorate a line; they create a sense of narrative discontinuity—like a speaker whose thought keeps being interrupted. Modern criticism has even treated the work as an analytical test case: if a piece is designed to sound spontaneous, should analysis try to impose a single underlying plan, or should it honor the discontinuity as the point? That debate—sparked in part by source questions raised after the 1990 rediscovery—has become a minor literature of its own [6].
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Second, the Fantasia’s texture alternates between bare, almost recitative-like writing and densely worked figuration that looks forward to the nineteenth century’s piano idiom. The opening’s broken-chord writing can feel like an improvised prelude; later passages cultivate urgency through rapid motion and sudden dynamic turns. The result is not a “sonata without rules,” but a deliberate staging of contrasting keyboard personae: the searching rhetorician, the brilliant virtuoso, the lyrical singer, the contrapuntal thinker.
For performers, this helps explain why the work is so often coupled with K. 457 even in modern recital practice: the Fantasia does not merely share a key with the sonata; it supplies a psychological prologue. Heard this way, K. 475 frames the sonata’s opening Allegro as an answer to a question already posed—an answer that feels hard-won rather than merely formal.
Reception and Legacy
Artaria published the Fantasia together with the C-minor sonata in December 1785 as Op. 11, an unusual publication strategy for Mozart’s piano sonatas and a sign that the pair was being marketed—and perhaps understood—as a compound statement [2] [4].
The work’s later prestige has been reinforced not only by performance tradition, but also by philology. The 1990 reappearance of the autograph manuscript turned K. 475 into a case study in how “canonical” texts can remain unsettled: pianists today may be playing slightly different Fantasias depending on which modern edition they trust, and scholars continue to connect interpretive questions (such as pacing and articulation at junctions between sections) with the work’s complex transmission [5] [6].
In performance and listening culture, the Fantasia’s legacy is equally tied to its hybrid identity: it is both a composed masterpiece and a composed image of improvisation. That duality—so central to Mozart’s Viennese fame—helps explain why K. 475 remains perennially modern. It teaches that freedom in music is not the absence of craft, but one of craft’s most persuasive illusions.
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Noter
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[1] Köchel Verzeichnis (Mozarteum): KV 475 work entry with Mozart’s catalogue date (20 May 1785) and autograph key-signature note.
[2] Wikipedia: overview of Fantasia in C minor, K. 475 (publication with K. 457; structure; autograph auction and current location).
[3] Oxford Academic (Master Musicians: Mozart): contextual discussion of K. 475 as “carefully honed improvisation” in 1785 Vienna.
[4] Köchel Verzeichnis (Mozarteum): KV 457 work entry with dedication context (Therese von Trattner) and print information (Fantasia preceding sonata).
[5] Cambridge Core (Mozart’s Piano Sonatas): chapter noting Sotheby’s auction (21 Nov 1990) of the rediscovered autograph for K. 475 and K. 457.
[6] Journal of the Royal Musical Association (Cambridge Core): article on editorial problems and analytical/critical consequences for Mozart’s C-minor Fantasy, K. 475.